Development of highly sensitive passive sampler for nitrogen dioxide using porous polyethylene membrane filter as turbulence limiting diffuser

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• 作者：Yoshika Sekine ; Simon F. Watts ; Andrew Rendell ; Michio Butsugan
• 关键词：Passive sampler ; Diffusion filter ; Nitrogen dioxide ; Turbulence ; Sampling rate ; Palmes’ ; tube
• 刊名：Atmospheric Environment
• 出版年：2008
• 出版时间：June 2008
• 年：2008
• 卷：42
• 期：18
• 页码：4079-4088
• 全文大小：444 K

文摘

A new design of passive sampler is described which is appropriate to reduce the sampling resolution of most formats of Palmes’ tubes from weeks to 24 h or less. The sampler employs a flat-type porous polyethylene membrane filter as a diffuser, which controls mass transfer of the target analyte from ambient air to impregnated trapping filter. The new design is applicable to any analyte for which there is a paper Palmes’ tube method, e.g. H₂S, OCS, NO, SO₂, O₃, organic acids, NH₃ and so on. As an example, the sampler for the determination of ambient atmospheric nitrogen dioxide (NO₂), employing a trapping filter impregnated with triethanolamine is described. Performance of the new sampler was evaluated in laboratory and field experiments. The sampling rate was measured directly at four kerb-side sites in Oxford, UK and Kanagawa, Japan, by comparing measured concentrations from the samplers with co-located automated NO₂ analyzers. Results showed mass transfer rate of NO₂ within the diffuser did not change with external wind speed (0.5–2 m s⁻¹). The passive device had relatively higher sampling rate than those of previous samplers and gave equivalent results on NO₂ concentrations to the automated NO₂ analyzer at 24 h or less sampling duration. LOD and LOQ indicated possible application of these devices to sampling in urban intermediate, urban background and suburban areas.